Which generation exhibits only one of the two parental traits?

• A. F0
• B. F1
• C. F2
• D. Filial generation

Answer: (B)

The F1 generation, or the first filial generation, is a key concept in genetics, particularly in the study of inheritance patterns. In a typical monohybrid cross, two parent organisms (the P generation) with differing traits are crossed. The offspring produced in the F1 generation inherit one allele from each parent.

During this process, the dominant trait will be expressed, while the recessive trait remains hidden or masked. Therefore, the F1 generation will exhibit only the dominant trait and not the recessive trait, displaying a uniform phenotype that reflects the dominant allele from one of the parental traits.

In contrast, the F0 generation consists of the original parent organisms before any crossing occurs, while the F2 generation, which arises from crossing the F1 individuals, can show a mix of both parental traits due to the segregation of alleles. The term "filial generation" generally refers to the same context as F1 or may encompass subsequent generations, but it is the F1 specifically that displays only one parental trait.